Validation of the periodicity of checks of nuclear power plant safety systems using the bars system of programs

The application of the BARS program system for choosing the optimal parameters for checking the serviceability of the safety systems of nuclear power plants is described. The types of checks as well as the mathematical models determining the reliability of the components of the system for each type of check are described. Calculations of the failure probability of the safety systems of nuclear power plants which incorporate components with different levels of reliability are presented. The values of the optimal period between serviceability checks for each type of system are determined. An evaluation of the effect of failures of a general type on the reliability of safety systems is presented for two forms of the α -factor model.